GoChronos Tool Directory — Browse All 80+ Free Tools
Search and discover free online tools for time, dates, health, finance, cricket, security, developer utilities and more at https://gochronos.com.
Time & Clocks
- World Clock — Live world clock dashboard showing current times in hundreds of cities, interactive day/night terminator map, UTC offsets and quick timezone comparisons. Ad-free, works offline.
- Calendar — Multi-system calendar with Gregorian, Hindu, Saka, Hijri and Hebrew date conversion. Navigate any month across five calendar systems with a single click.
- Holidays — Browse public holidays, bank holidays and national observances by country and year. Covers 60+ countries with filterable calendars and printable year views.
- Timers — Precision stopwatch & countdown timer and Pomodoro focus timer in one ad-free hub.
- Stopwatch & Countdown — Precision stopwatch with lap timing and split times, plus a countdown timer to any future date or duration.
- Pomodoro — Classic 25-minute focus / 5-minute break Pomodoro timer with customisable session lengths, audio alerts and session counter. Free, ad-free, works offline.
- Multi-Timer & Presets — Run multiple named timers simultaneously. Includes kitchen, workout and focus presets, plus a custom interval timer for rounds of work and rest.
- Discover — Explore notable historical events, births, deaths and observances that happened on today's date across centuries of recorded world history. Updated daily.
Planning & Dates
- Time Zones — All GoChronos timezone tools in one place: world clock, timezone converter, meeting planner and team roster. Find the best meeting time across any time zones.
- Timezone Converter — Instantly convert times between any two cities, UTC offsets or timezones. Compare multiple zones side by side for calls, travel and meeting scheduling.
- Meeting Planner — Find the best meeting time across time zones with an interactive heatmap and timeline view. Export to Google Calendar, Outlook or ICS and share a pre-filled link.
- Team Roster — Track your distributed team's working hours, local times and overlap windows in one shared roster. See who is online now and plan handoffs across time zones.
- Date Calculators — Calculate the difference between two dates, add or subtract days, and work with Unix timestamps and cron expressions.
- Date Difference — Find the exact number of years, months, weeks, days, hours and minutes between any two dates.
- Add / Subtract Dates — Add or subtract days, weeks, months or years from any starting date and instantly see the resulting date and day of the week. Ideal for deadline planning.
- Work Days Calculator — Count working days between dates, excluding weekends and public holidays for the US, UK, India, Canada, Australia and Germany.
- Duration Calculator — Calculate the precise time duration between two timestamps in hours, minutes and seconds. Perfect for billing, race results, log analysis and elapsed time.
- Unix Timestamp — Convert Unix epoch timestamps to and from human-readable dates with millisecond precision.
- Cron Translator — Translate cron expressions to human-readable schedules and preview upcoming run times.
Life, Health & Finance
- Travel & Sky — Precise sunrise, sunset, golden hour and moon phase times for any destination. Plan travel photography, early hiking starts and evening sky-gazing events.
- Sun & Moon — Precise sunrise, sunset, golden hour and twilight times plus moon phase, illumination, moonrise and moonset for any city.
- Sky Events — Upcoming meteor showers, dark-sky viewing conditions and the full celestial event calendar for your city. Never miss a meteor shower or aurora opportunity.
- Trip Countdown — Count down to your next trip and build a smart packing checklist you can save and share. Never forget a passport, charger or essential travel document again.
- Personal Time & Age — Find your exact age in years, months, days and hours. Track life-stage milestones, birthday countdowns and anniversaries. Fully private — runs in your browser, nothing uploaded.
- Health & Body — Free health calculators: BMI with WHO guidance, plus a metabolic suite covering BMR, TDEE and daily calorie & macro targets.
- BMI Calculator — Calculate your body mass index from height and weight in metric or imperial units. Get WHO category guidance (underweight, normal, overweight, obese) with an ideal-weight range. Free, private, no upload.
- Metabolic Calculator — All-in-one metabolic calculator: basal metabolic rate (BMR), total daily energy expenditure (TDEE) and calorie & macro targets for any goal.
- Finance & Numbers — Free finance calculators: loan amortisation, tip splitting, percentage maths and GPA calculation in one ad-free hub.
- Loan & Mortgage — Calculate loan, mortgage or auto EMI with full amortisation schedule, total interest and payoff timeline.
- Tip & Bill Split — Calculate tip amount and split a bill between any number of people with custom tip percentages and rounding.
- Percentage Calculator — Calculate percentage of a number, percent change, increase, decrease and percentage difference with worked steps.
- GPA Calculator — Calculate weighted and unweighted GPA across courses with custom grade scales and credit hours.
- Random & Fun — Spin a decision wheel, roll dice, flip coins, pick names, generate random numbers and more — all ad-free.
- Decision Wheel — Spin a customisable wheel of fortune to pick a winner, decide an outcome or choose randomly from any list.
- Random Number Generator — Generate one or many random integers or decimals within any range, with optional uniqueness and sorting.
- Dice Roller — Roll any combination of polyhedral dice with totals, modifiers and roll history for tabletop games.
- Coin Flip — Flip a virtual coin once or in bulk and track heads-versus-tails statistics across the session.
- Name Picker — Pick a random name or item from your list with optional removal so the same entry isn't drawn twice.
- Tally Counter — Simple tally counter to count anything with increment, decrement, reset and a persistent running total.
- Birthday Paradox — Compute the probability that two people in a group share a birthday. Includes Monte-Carlo simulation and reverse lookup.
- Cricket Calculators — Cricket maths in one place: current run rate, required run rate, batting strike rate, net run rate (NRR), DLS revised targets and an overs-to-balls converter.
- Run Rate & Chase — Calculate current run rate and required run rate for chases with overs, balls and target inputs.
- Batting & Bowling Stats — Calculate batting strike rate and bowling economy rate from runs, balls faced and overs bowled.
- Duckworth–Lewis (DLS) — Estimate revised targets in rain-affected limited-overs cricket matches using the Duckworth-Lewis-Stern method.
- Net Run Rate — Compute team net run rate across a tournament from runs scored, runs conceded and overs played and bowled.
- Overs ↔ Balls Converter — Convert between cricket overs (e.g. 12.3) and total balls bowled, with addition and subtraction support.
Developer & Utility Tools
- Security & IDs — Developer security utilities: password and passphrase generation, UUID/ULID/NanoID, JWT decoding, hashing and ciphers.
- Password Generator — Generate strong random passwords or memorable passphrases with full control over length, charset and entropy estimate.
- ID Generators — Generate UUID v4/v7, ULID, NanoID and Snowflake IDs in bulk with copy and CSV export.
- JWT Toolkit — Decode JSON Web Tokens to inspect header, payload and signature, or generate signed JWTs with HS256/RS256.
- Hash & HMAC — Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512 and HMAC hashes locally in your browser — nothing uploaded.
- Text Encryption — Encrypt and decrypt text with AES-GCM, plus classic Caesar and Vigenère ciphers, all in the browser.
- Web & Design Tools — Front-end dev tools: CIDR calculator, color converter, CSS gradient, CSS shadow and favicon generators, OG image creator and color palette extractor.
- CIDR / Subnet Calculator — Calculate network, broadcast, mask, usable hosts and subnet ranges for any IPv4 or IPv6 CIDR block.
- Color Studio — Convert between HEX, RGB, HSL and OKLCH and check WCAG AA/AAA contrast ratios for text and UI.
- CSS Gradient Generator — Build linear, radial and conic CSS gradients with multiple stops and copy the production-ready CSS.
- CSS Shadow Generator — Design layered CSS box-shadow and text-shadow effects with live preview, multiple shadow-sm layers, inset support and one-click production-ready CSS output.
- Favicon Generator — Generate favicons from text, emoji or initials. Custom background and font. Download PNG in all sizes: 16, 32, 48, 64, 128 and 180 px plus an HTML link tag.
- OG Image Generator — Design 1200×630 Open Graph images for social sharing with gradient backgrounds, emoji, title, subtitle and domain. Export PNG and copy meta tags for any site.
- Palette Extractor — Upload any image to extract a dominant color palette of 4–12 colors. Copy HEX, RGB or HSL values and export as CSS variables, JS array or Tailwind config.
- HTTP & Network Tools — Developer network tools: cURL command converter, DNS lookup, SSL certificate checker and regex pattern library.
- cURL → Code Converter — Convert cURL commands to JavaScript (fetch), Python (requests), Go, PHP, Java and Ruby code instantly. Paste any curl command and get production-ready code.
- IP & DNS Lookup — Query any domain's DNS records — A, AAAA, MX, TXT, CNAME, NS and SOA — instantly via Google Public DNS. Debug email routing, domain setup and propagation.
- SSL Certificate Checker — Inspect SSL/TLS certificate details for any domain: validity, expiry, issuer, subject alternative names and certificate chain via crt.sh.
- Converters & Misc — Everyday utilities: metric and imperial unit conversion, number-to-words for cheques, side-by-side text diff highlighting and a calculator with history tape.
- Unit Converter — Convert between metric and imperial units of length, weight, volume, temperature, speed, area and more.
- Number to Words — Convert any number — integers, decimals or currency — into written English words for cheques and invoices.
- Text Diff & Compare — Compare two blocks of text side by side with line and word-level diff highlighting and copy support.
- Calculator — Basic arithmetic calculator with a persistent history tape, memory keys and full keyboard support. Works offline.
- Text Tools — Five text utilities in one hub: case converter, Unicode font styler, find-and-replace with regex, word counter and Roman numeral converter. Free, no install.
- Case Converter — Switch text between sentence, title, UPPER, lower, alternating and inverse case in one paste.
- Unicode Fonts — Turn plain text into bold, italic, script, fraktur, small caps, monospace and dozens of other Unicode font styles.
- Find, Replace & Sort — Find and replace text with full regex support, sort lines alphabetically or numerically, remove duplicates, trim whitespace and wrap columns — all instant, nothing uploaded.
- Text Analysis — Word, character, sentence and paragraph counts, reading & speaking time, plus a word-frequency chart.
- Roman Numerals — Convert any number from 1 to 3999 — or any calendar date — into classic Roman numeral notation.
- Markdown & Docs — Live Markdown editor, HTML/plain text converter and a powerful dummy data generator for testing layouts, components and APIs.
- Live Markdown Editor — Write Markdown in a clean, distraction-free editor with a live HTML preview side by side. Export as HTML, download or copy the rendered output in one click.
- Markdown to HTML — Convert Markdown to HTML or plain text and back, with safe sanitisation and copy-ready output.
- Lorem & Dummy Data — Generate placeholder text, Markdown, HTML, Lorem Ipsum, JSON or CSV with full control over paragraphs, words, titles, lists, tables, code blocks and more.
- Code Formatters — Format and beautify JSON, SQL, HTML, CSS, JavaScript, TypeScript, YAML and more.
- Prettier Formatter — Beautify JavaScript, TypeScript, HTML, CSS, SCSS, LESS, JSON, Markdown and YAML in your browser using Prettier. Instant formatting with zero configuration.
- JSON Toolkit — Pretty-print, minify and validate JSON with live structure stats and size differences.
- SQL & XML Formatter — Beautify SQL queries across 10 dialects, or pretty-print and minify XML, SVG, RSS and OPML — all in one tool.
- Regex Tester & Library — Test JavaScript regular expressions live with highlighted matches, flag toggles and capture groups — or browse and load 47+ ready-to-use patterns for email, URL, IP, dates, passwords and more.
- Data Converters — Convert between JSON, YAML, CSV, XML, TSV, Markdown tables and query strings in one click. Paste any format and get instant output in every other format.
- Structured Data (JSON/YAML/XML) — Convert between JSON, YAML, XML and TypeScript types with formatting and validation in one place.
- Tabular Data (CSV/TSV) — Convert spreadsheets between CSV, TSV and Markdown tables with header detection and live previews.
- Encoders & Decoders — Encode and decode Base64/URL/HTML, build URL slugs and convert between number bases.
- Base & Text Encoders — Encode and decode Base64, Base32, Base58, Base85, Morse code and binary — all directions, entirely in your browser.
- Escape & HTML Entities — URL percent-encoding, HTML entity escaping and Unicode \uXXXX escape sequences — encode and decode in both directions, entirely in your browser, no uploads.
- URL Parser & Inspector — Parse any URL into protocol, host, pathname, query string parameters and fragment hash in one click. Rebuild or debug deep-linked and API URLs without guessing.
- Slug & Base Converter — Build URL-friendly slugs and convert numbers between any base from 2 to 36 (binary, octal, decimal, hex and beyond).
- PDF & Image Tools — PDF and image tools in one place: merge, split, extract text from PDFs; convert, resize and compress images; generate and scan QR codes — all browser-side.
- PDF Merge & Split — Merge multiple PDFs into one file, split documents into individual pages or extract all text — processed locally in your browser with no uploads to any server.
- OCR — Image & PDF to Text — Run optical character recognition on images and PDFs in your browser. Extract text without any uploads.
- Image Converter & Resize — Convert, resize and compress images between PNG, JPG and WebP formats locally in your browser. No uploads, no accounts needed and no file size restrictions.
- QR Code Generator & Reader — Generate styled QR codes for URLs, text or contacts and decode QR codes from any image.